A: Absolutely not. If you install that, you will merge your console’s unique keys (movable.sed) with a stranger’s. Your 3DS will refuse to boot. You have been warned.
If you have Luma3DS custom firmware installed, download the latest GodMode9.zip . Extract the luma folder and gm9 folder to the root of your SD card. Also copy the GodMode9.firm to /luma/payloads/ and rename it to x_GodMode9.firm (the x makes it boot by holding Start). 3ds nand download install
Hold (Start) while powering on your 3DS. Select GodMode9 from the menu. A: Absolutely not
Copy this file immediately to your computer, an external hard drive, and a cloud backup service. Keep it safe. Without this file, your unique console encryption is lost forever. Part 4: How to INSTALL (Restore) a NAND Backup You only do this if your 3DS is bricked—black screen, blue light that turns off, or a crash on boot. This process writes a NAND image back to the chip. You have been warned
Stay safe, and happy modding.
If your 3DS is bricked, you may need to force boot GodMode9 using a magnet (for Old 3DS) or an RCM-like jig. However, most soft bricks still allow GodMode9 via the Luma chainloader: Hold (Start) + (Select) + (X) while powering on to force GodMode9 load from SD.
You will see a file named something like: [NAND - 12345678.bin] (or NAND_min.bin for a minimal backup).